[Feature Request] Allow multiline properties

[radeksvarz]

Currently only Documentation allows multiline editing / view in the UI.
I would like to store (or synchronise with external sources) some multiline properties for elements.

How it could be implemented:
The properties list as is. Meaning the multiline value would either show the first line, or flattened lines right-trimmed with 3 ...
If I hover over the property value in the list, the multiline "hint" shows up (like in web browser).
If I single click on the property value, the current behavior is executed (i.e. inline editing of single line).
If I double click on the property value in the Properties list, the multiline text area opens.

AFAIK the xml file storage structure already enables this, so I assume it is only the matter of UI.